If you’re getting the error on a triggered Flow, such as:
Entity 'callbackregistration' With Id = xxxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxx Does Not Exist
You should check to ensure that the Flow is turned “On”. It’s easy to miss this hugely important detail in that tiny bit of text that look like all the other text.

The answer was gleaned from https://www.iversis.com.au/post/microsoft-bug-causing-flow-not-triggering
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